Lost Communication With Seat Memory Module A
What does U0178 mean?
The U0178 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Seat Memory Module A. This is a low severity code.
Common Symptoms
- Seat memory function not working
- Saved seat positions not recalling
- Memory seat buttons unresponsive
- Mirrors may not adjust with seat memory
- Driver profile selection not functioning
Probable Causes (Ranked by Likelihood)
- Failed seat memory module Very High
- Damaged wiring under the driver seat High
- Corroded connector at seat memory module Moderate
- Seat track motor encoder failure Low
Step-by-Step Diagnostic Procedure
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Check the seat memory fuse in the interior fuse box
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Inspect wiring under the driver seat for damage from seat movement
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Verify power and ground at the seat memory module connector
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Check CAN bus communication at the module
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Try manual seat adjustment to verify the seat motors still work
Frequently Asked Questions
Can I drive with code U0178?
Yes, completely safe to drive. The seat can still be adjusted manually. Only the memory recall feature is unavailable.
What causes U0178?
Most commonly a failed seat memory module or damaged wiring under the driver seat. Wires can chafe from seat track movement over time.
Is U0178 expensive to fix?
Typically $150 to $600. Wiring repairs are less expensive while module replacement with programming is on the higher end.